Core drill



Nov. 3, 1931.

G. J. BARRETT ET AL CORE DRILL Filed Feb. l5, 1930 Patented Nav. 3, 1931 A UNITED STATI-:s

PATENT OFFICE GEORGE J'. BARRETT, HOUSTON, AND SOSTHEN'E ROBICHA'UX, 0F SARATOGA., TEXAS CORE DRILL -Application led February 13, 1930. kSerial No. 428,210.

This invention relates to new and useful improvementsin a core drill. d

One object of the invention is to provide a device of the character described whereby samples of the formation being pierced 1nwell vdrilling may be readily obtained and withdrawn to the ground surface for inspection. v

Another object of the invention is to pro-` lo vide, in a device of the character described,

a core barrel or sample chamber for receiving the core or sample and which may be readily withdrawn to the ground vsurface independent of the drill stem and drill and which may be readily inserted through the drill stem Aand located in position for receiving the core or sample. g

A further feature of the invention resides in the provision of apparatus of the char- `2 acter vdescribed/having a fluid passageway around the core barrel through which the drilling fluid may be supplied to the cutting point of. the bit or drill without reaching w and contaminating the'sample being taken.

With the above and other objects in view theinvention has particular relation to certain novel features of construction, operation andl arrangement of parts, an example of which is given in this specification and illustrated in the'accompanying drawings where- Figure 1 shows a vertical sectional view of the apparatus partly broken away.

Figure 2 shows a cross sectional'view taken on the line 2-2 of Figure 1, andK ,d Figure 3 shows a-bottom end view of the rill. Referring now more particularlyl to the drawings wherein like numerals of reference l designate similar parts in each of the iigures, the numeral 1 designatesa tubular drill stem to the lower end of which a core orming drill 2 is attached bymeans of the drill collar 3. This drill may be of any selected type and it has the axial bore 4 therethrough to permit the inlet of a sample and the lower end of said bore being slightly reduced to form the inside annular shoulder 5 which forms a support for the tubular core barrel or sample chamber 6 whose lower end is fitted into the enlarged portion of the bore 4 and rests on said shoulder.

Screwed into the upper end of the bore 4 and surrounding the barrel 6 there is a cylinder 7 whose upper end is flared forming the annular partition 8 between the core barrel and drlll stem, said partition being provided with a plurality of ports as 9. As shown the cylinder 7 is spaced from the stem 1 so as to form a channel 10 havin the downwardly diverging outlet ducts 11 t rough the drill 2 above the side cutters 12.

The core bairel has one or more expansible metal packing rings 13 therearound and above these thereare the upwardly opening cup rings 14 also mountedon said barrel. These rings 13, 14 fit closely within the upper end of the cylinderf'? when the core barrel is assembled in place in the apparatus.

When the device is assembled as above explained and as shown in Figure 1 drilling may be proceeded with in the usual way by rotating the drill stem 1 and as the drill 2 pierces the formation a sample tion will enter the core barrel. Drilling fluid under pressure may be forced downwardly through the stem 1, the ports 9, channel 10 and outlet ducts 11 to carry away the cuttings Jfrom the drill and thisflushing fluid w1ll return up through the well bore on the outside of the stem 1. The drilling Huid, however is discharged as is obvious some distance above the inlet end of the port 4 and the fluid will thus be sealed olf from entering the lower end of said bore and the cylinder 7 and packing rings 13, 14 will prevent the drilling fluid from entering the core barrel directly so that a practically uncontaminated sample of the formation may be obtained.

The upper end A outlet passageway 15 controlled by the upwardly opening ball valve 16 which is conlined by the cage 17 attached to the u per end of said barrel. The upper end o the cage has conical shaped head 18 thereon.

When a sample has been taken and it is desired to remove the same to the ground surfacea fishing tool of conventional constem and engaged over the head 18 and the of the core barrel has an.

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Y The core barrel may core barrel withdrawn to the ground surface. While withdrawing the core barrel the passageway 15 will be closed by the valve 16 and thiswill ordinarily prevent the core from' dropping out although other core retaining means may be provided in the lower end of the b arrel if desired. When the core or sample is entering the core barrel the valve 16 will lift to permit the escape of air or fluid in the core barrel above the sample.

be lowered' through the 'stem by a suitable cable connected to the head 18 by means of a detachable fishing tool and its lower end will be guided into the cylinder, by the upwardly flared partition 8, and will finally land on the shoulder -5 with the packing rings 13, 14 in the upper end of the cylinder and said core barrel will be maintained in place by the pressure of the fluid above against said packing rings during operations.

The drawings and description disclose what is now considered to be a preferred form of the invention by way of illustration only, while the broad principle of the invention will be defined by the appended claims.

1. A sample taking device -including a. tubular stem, a. drilling tool attached to the lower end thereof having an axial bore provided with an inside seat, a. core barrel in the stem whose lower end is ,unattached to, but rests on said seat, a cylinder around said barrel whose upper end is formed into a guide and whose lower end is attached to said drilling tool, packing rings between said barrel and cylinder, said cylinder bein spaced from the stem to form a channel or fluid, and said device having a fluid outlet leading from said channel.

2. A sample taking device includinga tu bular stem, a drillin tool attached to the lower end thereof an having an axial bore, a core barrel in the stem in alignment with said borev and whose lower end is associated with, but unattached to, said tool, a cylinder around the stem and within and spaced from the barrel forming a fluid channel between the cylinder and stem., the upper end of said cylinder being flared and formed with an opening for iiuid and the lower endof said cylinder being attached to said tool, said device having an outlet leading from the lower end of said channel, and packing around the barrel and between saidbarrel and the upper end of said cylinder. v

3. A sample taking device including a tubular stem having'a cylinder in the lower end thereof spaced from the stem, a drilling tool attached to the lower end of the stein and cylinder and having4 a bore, the space between the stem and cylinder having aV lower end outlet, a sample chamber within the cylinder, and packing means including packing rings and cup rings, forming an approxisample partition between said cylinder and stem, a-

corebarrel in said cylinder arranged to re- `celve a sample through 'said' bore, packing around the barrel forming a substantially fluid tight joint with the cylinder, there being a channel for drilling iiuid leading from within the stem above said packing and whose lower end terminates on the outside of the device above the inlet end of said bore.

5. A sample taking device including a tubulardrill stern, lower end thereof, a tubular core barrel in, and removable independently of, the stem whose lower end is associated within said tool said tool having a. core receiving inlet opening into the barrel, a cylinder attached to the tool and surrounding the lower end of the barrel and whose upper end is formed with a guide, a packing between the cylinder and barrel, there being fluid passageway,i leading from withinrthe l ing and terminating on the outside of the device above said inlet.

6. A sample taking device including a tubular drill stem, a core forming tool at the lower end thereof, va tubular core barrel in the stem whose lower end is associated within said tool said tool having a core receiving inlet opening into the barrel, a cylinder attached to the tooll and surrounding the lower stem above the packend of the barrel and whose upper end is 'I formed with a cylinder and sageway leading from within the stem above the packing and terminating on the outside guide, a packing between the of the device-about said inlet, said barrel hav-- ing a valve end. u, v

.7. A core drill having a stem, a core barrel controlled outlet at its upper barrel, there being iiuid pas-v slidable upwardly and downwardly in said stem, said barrel having a core chamber, and

a packing on said barrel above said chamber,

said packing being radially expansible until its external diameter is greater than the eX- ternal diameter of said barrel.

8. A core drill having a stem, an inner tube in said stem, a corebarrel slidable in said stem downwardly into and upwardly out of said tube, said barrel said barrel above said chamber to seal the space bet-Ween said barrel and tube.

9. A core drill having a stem, a core bai'-V having a core chamber.

having acore chamber, and a radially expansible packing on tion, said packing being radially expansible until its external diameter is greater than the external diameter of said barrel.

10. A core drill having a stem, an inner tube in said stem, a core barrel slidable in said stem downwardly into and upwardly out of said tube, said barrel ,having a core chamber in its lower end, a reduced portion above said chamber, and a radially expansible packing on said reduced portion to seal the space between said barrel and tube.

1.1'. A core drill having a stem, a bit on the lower end of said stem, an inner tube spaced Within said stem and extending upwardly from said bit, a core barrel slidable in said stem downwardly into and upwardly out of said tube, said barrel having a downwardly opening core chamber and a reduced portion above said chamber, and a packing on said reduced portion to seal the space between said barrel and tube.

12. A core drill having a stem, a bit on the lower end of said stem and having a fluid duct therethrough, an inner tube spaced within said stem and extending upwardly from said bit, the space between said tube and stem forming a slush passageway in communication with said duct, a core barrel slidable in said stem downwardly into and upwardly out of said tube, said barrel having a downwardly opening core barrel and a reduced portion above said chamber, and a packing on said reduced portion to seal the space between said barrel and tube.

In testimony whereof we have signed our names to this s eciiication.

GE RGE J. BARRETT. SOSTHENE ROBICHAUX. 

